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微机在对低频信号的频率实时检测、处理时,要求输入的信号幅度是一个稳定值。在多通道的共用放大器分时工作中,由于各个通道输入幅值大小不等,放大器输出幅度相差很大,甚至会出现输入大的信号已放大失真,输入小的信号还不能满足要求,即使是采取自动增益控制,输入值大小相差也不能太悬殊,否则自动增益将失控。为了解决稳幅问题,本文介绍一种实用的自动稳幅电路。该电路的基本思路是,将输入的低频信号整流成直流分量,经滤波、功率放大后再变换成数字量,由数字量的大小控制低频信号衰减的大小,
Computer in real-time detection of low-frequency signal frequency, processing, the required input signal amplitude is a stable value. In multi-channel shared amplifier time-sharing work, due to the various input amplitude range of different channels, the amplifier output amplitude vary greatly, and even large input signal distortion has been enlarged, the input signal can not meet the requirements of small, even if Take automatic gain control, the input value of the difference between the size can not be too poor, or automatic gain will be out of control. In order to solve the problem of steady amplitude, this article introduces a practical automatic steady amplitude circuit. The basic idea of the circuit is to rectify the input low-frequency signal into a DC component, filtered, power amplified and then converted into digital, the size of the digital control of low-frequency signal attenuation,